package com.kexun.common.utils;

import java.io.UnsupportedEncodingException;

public class UnicodeDecoder {
    public static String escape(String src) {
        int i;
        char j;
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length() * 6);
        for (i = 0; i < src.length(); i++) {
            j = src.charAt(i);
            if (Character.isDigit(j) || Character.isLowerCase(j) || Character.isUpperCase(j)) {
                tmp.append(j);
            } else if (j < 256) {
                tmp.append("%");
                if (j < 16) {
                    tmp.append("0");
                }
                tmp.append(Integer.toString(j, 16));
            } else {
                tmp.append("%u");
                tmp.append(Integer.toString(j, 16));
            }
        }
        return tmp.toString();
    }

    public static String unescape(String src) {
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length());
        int lastPos = 0, pos = 0;
        char ch;
        while (lastPos < src.length()) {
            pos = src.indexOf("%", lastPos);
            if (pos == lastPos) {
                if (src.charAt(pos + 1) == 'u') {
                    ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
                    tmp.append(ch);
                    lastPos = pos + 6;
                } else {
                    ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
                    tmp.append(ch);
                    lastPos = pos + 3;
                }
            } else {
                if (pos == -1) {
                    tmp.append(src.substring(lastPos));
                    lastPos = src.length();
                } else {
                    tmp.append(src.substring(lastPos, pos));
                    lastPos = pos;
                }
            }
        }
        return tmp.toString();
    }

    public static void main(String[] args) throws UnsupportedEncodingException {
        String str = "&#x63d0;&#x4ea4;&#x4e86;&#x9000;&#x7968;&#x7533;&#x8bf7;&#xff0c;&#x7533;&#x8bf7;&#x539f;&#x56e0;&#x662f;&#x3a;&#x8eab;&#x4f53;&#x539f;&#x56e0;&#x4e14;&#x6709;&#x4e8c;&#x7ea7;&#x7532;&#x7b49;&#x533b;&#x9662;&lt;&#x542b;&gt;&#x4ee5;&#x4e0a;&#x7684;&#x533b;&#x9662;&#x8bc1;&#x660e;&#xff1b;";
        str = str.substring(str.indexOf("&#x3a;") + 6);
        String name = str.replace("&#x", "%u");
        String name2 = name.replace(";", "");
        String str2 = unescape(name2);
        System.out.println("newStr: " + str2);

    }
}